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Katydids are mostly nocturnal insects related to crickets and grasshoppers and noted for their loud mating calls. The katydid derives its name from the male’s repetitive call, which has been phoneticized as "katydid, katy-didn’t." One European term for katydid, "tizi," also sounds similar to the insect’s call. Katydids, crickets, and grasshoppers are all orthopterans, meaning that they belong to the insect order Orthoptera. Katydids are generally classified in the long-horned grasshopper family (Tettigoniidae). The Tettigoniidae family consists of about 6,000 species divided into 1,070 genera and 19 subfamilies. The katydids are separated into two of these subfamilies: Pseudophyllinae and Phaneropterinae.